Google's First Female Engineer is Yahoo!'s new CEO

Marissa Mayer, one of the company's first 20 employees, and its very first female engineer, has left the search engine giant to take the reigns of rival Yahoo.

Marissa Mayer quit her job with Google on Monday. The 37-year-old Stanford graduate signed on with Google back in 1999. Over the years her Google job titles have included Product Manger, Director of Consumer Web Services, VP of Search Products & User Experience, and VP of Local, Maps & Location Services.

Now she is taking the reigns of Yahoo as its new President and CEO. Mayer was one of Google's top executives, responsible for products like Google Maps, Google Earth, Street View, and more. She had also managed Google Search for years, and led development on other products such as iGoogle, Google News and Gmail.

Mayer said in a statement: "I am honored and delighted to lead Yahoo!, one of the Internet's premier destinations for more than 700 million users.  I look forward to working with the Company's dedicated employees to bring innovative products, content, and personalized experiences to users and advertisers all around the world."

Update:  Marissa Mayer announced that she is pregnant. She spoke exclusively to CNN and confirmed that she and her husband are expecting their first child, a boy, in October. She first disclosed her pregnancy to the Yahoo! board in late June during a meeting with Michael Wolf, a member of the board's CEO search committee. Meetings with the rest of the board followed and Mayer said the board didn't show concern about hiring a pregnant CEO. "They showed their evolved thinking," she told Fortune.